Circulating graded leaching method of stone coal acid-leaching vanadium extraction sulfuric acid
A stone coal acid and leaching technology, which is applied in the direction of improving process efficiency, can solve problems such as increasing costs, and achieve the effect of reducing the amount of sulfuric acid and reducing the concentration of residual acid
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[0007] The mineral material is heated to 90-120℃ with a vanadium-containing sulfuric acid solution with a molar concentration of 1.3-1.5 in the stirring tank A according to a liquid-solid ratio of 0.35:0.65, and soaked for 8-12 hours. The sulfuric acid and mineral material are relatively shallow , The higher valence vanadium oxide reacts to generate tetravalent vanadium oxide, sulfate and water. The tetravalent vanadium is dissolved in the acid solution. At the same time, the hydrogen ion in the solution is greatly reduced, and the acidity of the solution drops to 0.2 mole. When the PH value is 2.5, the solid-liquid separation is carried out by a vacuum belt filter, and the liquid phase (also known as A leaching solution) is directly sent to the subsequent process for reduction and extraction treatment; the solid phase enters the B leaching stirring tank, and the liquid-solid ratio is 0.35:0.65. The 3 molar concentration of concentrated sulfuric acid solution is heated to 90-120...
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